There are several types of PowerBook G4 Aluminum models.

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"mac-boot", "shut-down"? what to do

when i open my mac, it keeps saying "mac-boot" or "shut-down". i type mac-boot, it does its thing, shuts down. i open it again, it says the same thing, "mac-boot". this happened only after i opened my battery to check the airport card cause my mac said the airport card wasn't installed

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It looks like it's booting in to openfirmware by default. Try resetting the PRAM. When you turn it on, hold "Command+Option+P+R" (All 4 Keys At Once) right after it makes the startup noise, and keep holding them until you hear it again.

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thanks it worked :)

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it did not work for me

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You might try asking your own question as your problem and solution may be different.

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